EP1131198A1 - Method for making a friction damper for linen washing machine, and the friction damper made thereby - Google Patents

Method for making a friction damper for linen washing machine, and the friction damper made thereby

Info

Publication number
EP1131198A1
EP1131198A1 EP99956330A EP99956330A EP1131198A1 EP 1131198 A1 EP1131198 A1 EP 1131198A1 EP 99956330 A EP99956330 A EP 99956330A EP 99956330 A EP99956330 A EP 99956330A EP 1131198 A1 EP1131198 A1 EP 1131198A1
Authority
EP
European Patent Office
Prior art keywords
friction element
friction
restraining
damper
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99956330A
Other languages
German (de)
French (fr)
Other versions
EP1131198B1 (en
Inventor
Roberto Ferlicca
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cima Italiana Molle Acciaio SpA Cia
CIMA SpA
Original Assignee
Cima Italiana Molle Acciaio SpA Cia
CIMA SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cima Italiana Molle Acciaio SpA Cia, CIMA SpA filed Critical Cima Italiana Molle Acciaio SpA Cia
Priority to SI9930257T priority Critical patent/SI1131198T1/en
Publication of EP1131198A1 publication Critical patent/EP1131198A1/en
Application granted granted Critical
Publication of EP1131198B1 publication Critical patent/EP1131198B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/44—Removing or ejecting moulded articles for undercut articles
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
    • F16F7/09—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other in dampers of the cylinder-and-piston type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/721—Vibration dampening equipment, e.g. shock absorbers

Definitions

  • the invention relates to a method for making a friction damper for linen washing machines.
  • the invention relates, moreover, to a friction damper for linen washing machines, made by the inventive method.
  • this restraining function is performed, according to a first technical solution, by a ring element which is arranged on the top of the hollow shell.
  • a second prior solution provides to use a suitable undercut portion for restraining the friction element, said undercut portion being made by re-processing the damper shell or casing.
  • both the disclosed prior arrangements are not operatively satisfactory and, moreover, they cause a great increase of the cost of the finished product.
  • the aim of the present invention is to provide a method for making a friction damper for linen washing machines, allowing to make a finished shell or casing, including the necessary housing for receiving therein the friction element, without the need of performing further processing operations after the molding proper.
  • a main object of the present invention is to provide a finished friction damper of reduced cost and which can be made in a very reduced operating time.
  • a friction damper for linen washing machines of the type comprising a rod which can be telescopically driven inside a mantle and at least a friction element, arranged between said rod and mantle and housed in an housing cavity, characterized in that said method comprises a first molding step for molding said friction element housing cavity, in which the male element of the mold operates in an axial direction, and a second operating step for making undercut portions for restraining said friction element, said first and second steps being carried out either simultaneously or in succession.
  • the male element of the mold by operating in an axial direction, provides the damper rod housing hole, the friction housing plane and a plurality of upward opened recesses.
  • the second operating step for forming said friction element housing cavity provides to open the mold, perpendicular to the axis of the damper mantle, to provide a plurality of undercut portions for restraining said friction element and a plurality of slots, formed on the outer surface of said friction element housing cavity or hollow.
  • the second operating step for making said friction element cavity or hollow provides to use suitable knives, operating from the bottom according to a vertical direction parallel to the mold male element to provide said friction element restraining undercut portions.
  • the present invention relates, moreover, to a friction damper for linen washing machines, of the type comprising a rod which can be telescopically driven in a mantle and at least a friction element, arranged between said rod and mantle and housed in a cavity therefor, characterized in that said cavity is provided with an housing plane or surface for housing said friction element, a plurality of upward open recesses, and a plurality of restraining undercut portions for restraining said friction element.
  • Figure 1 is a partially cross-sectioned side view of the linen washing machine friction damper according to an embodiment of the present invention
  • Figure 2 is an . axonometric view of a further embodiment of the present invention.
  • Figure 3 is a cross-sectional view, substantially taken along the section line III-III, of a modified embodiment of the present invention
  • Figure 4 is a top plan view of the embodiment of the invention shown in Figure 3.
  • Figure 1 shows, by a partially cross- sectioned view, a friction damper for linen washing machines, made according to the method of the present invention, and generally indicated by the reference number 1.
  • the friction damper 1 in particular, comprises a rod 4, which can be telescopically driven inside a mantle or casing 5 and comprising moreover a friction element 2 arranged between said rod 4 and mantle 5 and housed in a housing cavity or hollow 3 therefor; said mantle 5 including, in turn, a pair of windows 9.
  • the cavity 3 is provided with a housing plane or surface 8 for housing said friction element 2, as well as with a plurality of upward open recesses 7, and a plurality of undercut portions 6 for restraining said friction element 2.
  • Figures 3 and 4 show a modified embodiment of the damper according to the invention, in which the cavity 3 is provided, in addition to the friction element 2 housing surface 8 and upward open recesses 7, with a plurality of not throughgoing holes 11, which end at said friction element 2 restraining undercut portions 6.
  • cavities 3 for housing the friction elements 2 of the friction dampers shown in the above mentioned figures are made by the following method.
  • the inventive method comprises a first operating molding step, in which the male element of the mold, by operating in an axial direction, and in particular in the direction V shown in Figure 2, provides the housing hole for housing therein the rod 4 of the damper 1, as well as the friction element 2 housing surface 8 and the upward open recesses 7.
  • the subject method comprises moreover a second operating step for making the friction element 2 restraining undercut portions 6, which second step is carried out simultaneously with the opening of the mold.
  • said second operating step, for making said friction element 2 housing cavity 3 can be carried out according two different operating modes .
  • the first of said operating modes provides to open the mold, perpendicularly to the axis of the damper mantle 5 and, in particular, in the direction W shown in Figure 2, so as to provide the friction element 2 restraining cutout portions 6 and, simultaneously, a plurality of slots 10 formed on the outer surface of the friction element 2 housing cavity 3.
  • the second of the above mentioned operating modes for making said cavity 3 for housing therein said friction element provides to use suitable operating knives, operating from the bottom according to a vertical direction parallel to the mold male element, said knives forming non-throughgoing holes 11 ending at the friction element 2 restraining or holding undercut portions 6.
  • the above disclosed method in its main variations, allows to make a finished shell enclosing therein the cavity 3 for housing therein the friction element 2, thereby obviating any requirements of carrying out further processing steps after the molding, thereby greatly reducing the cost of the finished product and the making times therefor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Textile Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Fluid-Damping Devices (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
  • Mechanical Operated Clutches (AREA)
  • Vibration Dampers (AREA)

Abstract

The invention relates to a method for making a friction damper (1) for linen washing machines, comprising a first molding step, in which a male element of the mold, by operating in an axial direction, provides a hole for housing therein the damper rod (4), the housing plane (88) of the friction element (3) and a plurality of recesses (7), upwardly open, and comprising a second operating step for making the restraining undercuts (6) for holding the friction element, said first and second steps being carried out either simultaneously or in succession. The present invention relates, moreover, to a friction damper for linen washing machines made by the inventive method.

Description

Description
METHOD FOR MAKING A FRICTION DAMPER FOR LINEN WASHING MACHINE, AND THE FRICTION DAMPER MADE THEREBY
BACKGROUND OF THE INVENTION
The invention relates to a method for making a friction damper for linen washing machines.
The invention relates, moreover, to a friction damper for linen washing machines, made by the inventive method.
As is known, in linen washing machine friction dampers, the friction element, arranged between the rod and casing of the damper, must be axially restrained in its housing hollow, in order to properly operate.
In prior linen washing friction dampers, this restraining function is performed, according to a first technical solution, by a ring element which is arranged on the top of the hollow shell.
A second prior solution provides to use a suitable undercut portion for restraining the friction element, said undercut portion being made by re-processing the damper shell or casing. However, it has been found that both the disclosed prior arrangements are not operatively satisfactory and, moreover, they cause a great increase of the cost of the finished product.
SUMMARY OF THE INVENTION
Accordingly, the aim of the present invention is to provide a method for making a friction damper for linen washing machines, allowing to make a finished shell or casing, including the necessary housing for receiving therein the friction element, without the need of performing further processing operations after the molding proper. Within the scope of the above mentioned aim, a main object of the present invention is to provide a finished friction damper of reduced cost and which can be made in a very reduced operating time. According to one aspect of the present invention, the above mentioned aim and object, as well as yet other objects, which will become more apparent hereinafter, are achieved by a friction damper for linen washing machines, of the type comprising a rod which can be telescopically driven inside a mantle and at least a friction element, arranged between said rod and mantle and housed in an housing cavity, characterized in that said method comprises a first molding step for molding said friction element housing cavity, in which the male element of the mold operates in an axial direction, and a second operating step for making undercut portions for restraining said friction element, said first and second steps being carried out either simultaneously or in succession.
In particular, in the first molding step, the male element of the mold, by operating in an axial direction, provides the damper rod housing hole, the friction housing plane and a plurality of upward opened recesses.
According to a preferred embodiment of the inventive method, the second operating step for forming said friction element housing cavity provides to open the mold, perpendicular to the axis of the damper mantle, to provide a plurality of undercut portions for restraining said friction element and a plurality of slots, formed on the outer surface of said friction element housing cavity or hollow.
According to a further preferred embodiment of the inventive method, the second operating step for making said friction element cavity or hollow provides to use suitable knives, operating from the bottom according to a vertical direction parallel to the mold male element to provide said friction element restraining undercut portions.
The present invention relates, moreover, to a friction damper for linen washing machines, of the type comprising a rod which can be telescopically driven in a mantle and at least a friction element, arranged between said rod and mantle and housed in a cavity therefor, characterized in that said cavity is provided with an housing plane or surface for housing said friction element, a plurality of upward open recesses, and a plurality of restraining undercut portions for restraining said friction element.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages and characteristics of the present invention will become more apparent hereinafter from the following detailed disclosure, given by way of an illustrative but not limitative example, and with reference to the accompanying drawings, where:
Figure 1 is a partially cross-sectioned side view of the linen washing machine friction damper according to an embodiment of the present invention;
Figure 2 is an . axonometric view of a further embodiment of the present invention;
Figure 3 is a cross-sectional view, substantially taken along the section line III-III, of a modified embodiment of the present invention; and Figure 4 is a top plan view of the embodiment of the invention shown in Figure 3.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the following disclosure, reference will be made to some preferred embodiments of the present invention, illustrated by way of a non limitative example of several possible variations of the invention.
Figure 1 shows, by a partially cross- sectioned view, a friction damper for linen washing machines, made according to the method of the present invention, and generally indicated by the reference number 1.
The friction damper 1, in particular, comprises a rod 4, which can be telescopically driven inside a mantle or casing 5 and comprising moreover a friction element 2 arranged between said rod 4 and mantle 5 and housed in a housing cavity or hollow 3 therefor; said mantle 5 including, in turn, a pair of windows 9.
The cavity 3 is provided with a housing plane or surface 8 for housing said friction element 2, as well as with a plurality of upward open recesses 7, and a plurality of undercut portions 6 for restraining said friction element 2.
This embodiment is shown, by an axonometric view, in Figure 2.
Figures 3 and 4 show a modified embodiment of the damper according to the invention, in which the cavity 3 is provided, in addition to the friction element 2 housing surface 8 and upward open recesses 7, with a plurality of not throughgoing holes 11, which end at said friction element 2 restraining undercut portions 6.
In particular, the cavities 3 for housing the friction elements 2 of the friction dampers shown in the above mentioned figures are made by the following method.
More specifically, the inventive method comprises a first operating molding step, in which the male element of the mold, by operating in an axial direction, and in particular in the direction V shown in Figure 2, provides the housing hole for housing therein the rod 4 of the damper 1, as well as the friction element 2 housing surface 8 and the upward open recesses 7. The subject method comprises moreover a second operating step for making the friction element 2 restraining undercut portions 6, which second step is carried out simultaneously with the opening of the mold. In particular, said second operating step, for making said friction element 2 housing cavity 3, can be carried out according two different operating modes .
The first of said operating modes provides to open the mold, perpendicularly to the axis of the damper mantle 5 and, in particular, in the direction W shown in Figure 2, so as to provide the friction element 2 restraining cutout portions 6 and, simultaneously, a plurality of slots 10 formed on the outer surface of the friction element 2 housing cavity 3. The second of the above mentioned operating modes for making said cavity 3 for housing therein said friction element 2, provides to use suitable operating knives, operating from the bottom according to a vertical direction parallel to the mold male element, said knives forming non-throughgoing holes 11 ending at the friction element 2 restraining or holding undercut portions 6.
In this connection it should be pointed out that, in both said operating modes, the numbers and positions of the upward open recesses 7 and undercut portions 6 can be changed depending on requirements.
Thus, the above disclosed method, in its main variations, allows to make a finished shell enclosing therein the cavity 3 for housing therein the friction element 2, thereby obviating any requirements of carrying out further processing steps after the molding, thereby greatly reducing the cost of the finished product and the making times therefor. From the above disclosure it should be apparent that the invention fully achieves the intended aim and objects.

Claims

1. A method for making a friction damper for linen washing machines, of the type comprising a rod which can be telescopically driven inside a mantle, and at least a friction element, arranged between said rod and mantle and housed in a housing cavity therefor, characterized in that said method comprises a first molding step for molding said friction element housing cavity, in which molding step a male element of a mold operates in an axial direction, and a second operating step for making restraining undercut portions for restraining said friction element, said first and second steps being carried out either simultaneously or in succession.
2. A method for making a friction damper for linen washing machines, according to Claim 1, characterized in that in said first molding step, said mold male element, by operating in an axial direction, provides a hole for housing therein the damper rod, a housing surface for housing said friction element and a plurality of upward open recesses.
3. A method for making a friction damper for linen washing machines, according to Claim 2, characterized in that said second operating step for making said friction element housing cavity comprises the opening of said mold, perpendicularly to the axis of the damper mantle, to provide a plurality of restraining undercut portions for restraining said friction element and a plurality of slots, formed on the outer surface of said friction element housing cavity.
4. A method for making a friction damper for linen washing machines, according to Claim 2, characterized in that said second operating step for forming said friction element housing cavity provides to use suitable knives, operating from the bottom in a vertical direction parallel to said mold male element, to form said friction element restraining undercut portions .
5. A friction damper for linen washing machines, of the type comprising a rod which can be telescopically driven inside a mantle and at least a friction element, arranged between said rod and mantle and housed in a housing cavity therefor, characterized in that said cavity is provided with a housing surface for housing said friction element, a plurality of upward open recesses, and a plurality of undercut restraining portions for restraining said friction element.
6. A friction damper for linen washing machines, according to Claim 5, characterized in that said friction element restraining undercut portions are associated with slots formed on the outer surface of said friction element housing cavity.
7. A friction damper for linen washing machines, according to Claim 5, characterized in that said friction element restraining undercut portions are associated with non throughgoing holes, formed in a substantially vertical direction on the bottom portion of the shell of said friction element housing cavity.
EP99956330A 1998-11-17 1999-11-17 Method for making a friction damper for linen washing machine, and the friction damper made thereby Expired - Lifetime EP1131198B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9930257T SI1131198T1 (en) 1998-11-17 1999-11-17 Method for making a friction damper for linen washing machine, and the friction damper made thereby

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI982492 1998-11-17
IT1998MI002492A IT1303908B1 (en) 1998-11-17 1998-11-17 PROCEDURE FOR THE REALIZATION OF A CLUTCH SHOCK ABSORBER FOR WASHING MACHINE AND PRODUCT SO OBTAINED
PCT/IT1999/000371 WO2000029200A1 (en) 1998-11-17 1999-11-17 Method for making a friction damper for linen washing machine, and the friction damper made thereby

Publications (2)

Publication Number Publication Date
EP1131198A1 true EP1131198A1 (en) 2001-09-12
EP1131198B1 EP1131198B1 (en) 2003-02-05

Family

ID=11381076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99956330A Expired - Lifetime EP1131198B1 (en) 1998-11-17 1999-11-17 Method for making a friction damper for linen washing machine, and the friction damper made thereby

Country Status (9)

Country Link
US (1) US6494300B1 (en)
EP (1) EP1131198B1 (en)
AR (1) AR021284A1 (en)
AU (1) AU1295900A (en)
DE (1) DE69905279T2 (en)
EG (1) EG22101A (en)
ES (1) ES2192091T3 (en)
IT (1) IT1303908B1 (en)
WO (1) WO2000029200A1 (en)

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DE102004033531B4 (en) * 2003-07-10 2007-11-22 Aweco Appliance Systems Gmbh & Co. Kg Friction damper, in particular for drum washing machines
KR101276255B1 (en) * 2009-03-13 2013-06-20 아크시스템 일렉트로메카닉 사나이 베 티카렛 리미티드 에스티아이 Triple action friction shock absorber
DE102011015601A1 (en) 2011-03-30 2012-10-04 Wilo Se bearing bush
JP6076243B2 (en) * 2013-12-26 2017-02-08 京セラドキュメントソリューションズ株式会社 Image reading apparatus and image forming apparatus
US20170128823A1 (en) * 2015-11-06 2017-05-11 Jacqueline Lee Multilevel educational alphabet corresponding numbers word game
ITUB20161083A1 (en) * 2016-02-25 2017-08-25 C I M A Compagnia Italiana Molle Acciaio Cage to hold a friction ring to be used in a damper for vertical axis washing machines

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Also Published As

Publication number Publication date
EG22101A (en) 2002-07-31
WO2000029200A1 (en) 2000-05-25
ITMI982492A1 (en) 2000-05-17
AR021284A1 (en) 2002-07-03
AU1295900A (en) 2000-06-05
IT1303908B1 (en) 2001-03-01
DE69905279D1 (en) 2003-03-13
EP1131198B1 (en) 2003-02-05
DE69905279T2 (en) 2004-03-25
ES2192091T3 (en) 2003-09-16
US6494300B1 (en) 2002-12-17

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